Teledyne instruction manual HPM-2002-OBEVacuum Gauge

Page 29

Figure 4.3a

Figure 4.3b

This radiation loss is also independent of the thermal conductivity of the gas. It is somewhat dependent upon the absolute temperature of Rs and the ambient temperature, but since ∆T is kept to less than 20 °C, this

HPM-2002-OBEVacuum Gauge

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Contents Teledyne Hastings Manual Print History Table of Contents Troubleshooting Model 2002 Sensors FeaturesHPM-2002-OBE Analog Output Module HPM-2002-OBE Analog Output 4-20mA ModuleHPM-2002-OBE DeviceNet Module SpecificationsHPM-2002-OBE RS232/485 Output Module OBE Module Installation Transducer InstallationReceiving Inspection Quick StartPin Volt 20 mA RS232/485 Initial OperationHigh and Low Set Point Modes Analog OutputOverall Functional Description Cal Mode Run ModeAnalog Output GAS ModeGas Selection Table HPM-2002-OBEVacuum Gauge Analog Output 4-20mA Cal Mode Analog Output 4-20mA HPM-2002-OBEVacuum Gauge RS232/485 With Display Command SyntaxParamater Modification Commands Interrogation CommandsReset / Restore Commands Calibration Adjustment CommandsDevice Status Default RS232/485 SpecificationsModular Connector Pinout RS-485 Modular Connector Pinout R2-232 RJ-11 connector on left sideRun Mode DeviceNet description DeviceNet TMMidrange Coefficient Adjustment Zero Coefficient AdjustmentAtmosphere Coefficient Adjustment Calibration of the HPM-2002-OBETheory of Operation Vo = SPV+V1 Piezoresistive SensorHPM-2002-OBEVacuum Gauge Et = Es + Er + Eg Pirani SensorEs = K ∆T Am/L Er = σεTh4-Ta4AsHPM-2002-OBEVacuum Gauge Dual Sensor Operation Eg = Kg ∆T As/∆xEg = arLt273/Th1/2Th-TaAgP HPM-2002-OBEVacuum Gauge RS485 Address Advanced Setup GuideRestore Eeprom Turnaround DelayBaud Rate Data Bits/Parity Bits/Stop BitsRestore Factory Defaults Restore CalibrationSoftware Reset Frequently Asked Questions Why does my display read, Err1?Why does my display read, U .? Why does my display read, U.U?Why does my display read, . U? What are Err3, Err5, Err6 and Err7?Non-Warranty Repair Policy Warranty Repair PolicyDiagrams and Drawings HPM-2002-OBEVacuum Gauge HPM-2002-OBEVacuum Gauge